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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccde56692e423b259a456bf3028a86044a1c30b670eca5073596a600ea117c00' 
  AND token = 'srhTSn+zdW8Rz7oURiqWLl6C+30l6SPQ+p3UWUo2p9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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