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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41958e2622d27d994c1929f1e32ce1daf1d9fd8671aa676c26c027bee9edf61' 
  AND token = 'x+ifLc7jvNQGaeSHE0/5AAn1PloscM/hGxVe9vv4orE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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