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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51338f804ba711a590abb55736c2aab7cf9d78016fdc77e385ccbee37aaf712' 
  AND token = 'CRPxb1IT8WMqbuaiDA1C8DKjGMaUMIyq1qWX+J5IzaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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