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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291959d57603243074045439235a930b0fdd934e4afa506f0a65ae80b9e5a102' 
  AND token = 'RYpQjf4fxR88LNjzs9ArW1ghxTTI0CwwQOuj65kJTNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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