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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89387f4978e73e757195b716c058fc23cff14bbf8390c9afe6a0f4d8e0e37ede' 
  AND token = 'YL1UhAhxUwySenFAWAiS4Qlq7H2TvG1NnGKocN5f4t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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