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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c24c9d3c5a33c3db0aac1214f2c57dc4a6efeff6c47dc148cc9212732661e1d' 
  AND token = 'O7i/NmWYRt9igu7sIpPB3jDsu7DeynQnC9tLZ4zKhTg=' 
  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"
    }
  }
}