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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a657bbacffbe4685cb4b05425f8c8fde860f49ffc344edbca3c78dc6a45f8235' 
  AND token = 'QCeNBjIuKv7xqFP0+Tqfal+UEe8+QlKPu3113Na0cl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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