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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ce9e930d1fa538e772f3ef942a74aa99449008cfa3b664ddf72ca2c2471372' 
  AND token = 'ffGo7r67/1ckSvgKlAlyxJEeAuojGWRCmja0dtS5Qmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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