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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce63c5cd4acccf958f10b4e9d3386946c54ccf43755ad41d56105383e6635b84' 
  AND token = 'ltFy5QxQodkwAcuGhNbvvVPqWfNmN1A51Ou5ZXftu5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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