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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df1025255018b623253dad655f0092c221ca553462dd6c91f26c4a1e791df09' 
  AND token = 'Ie9yO+ATce9jK3nxceenO3pwgxdJsdfSKlFYk+c2tdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}