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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799083491218a974b8ddc15178eb240db77f275c6aa340c4c023942adf73e89f' 
  AND token = '7htZgHU0b6Ofer9mBzyex5nWgWo7AgjE0jx7QHmy4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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