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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15cd20eae2c3f0362156a18411dbb1ed9970cad95353b418e1109f17073b161e' 
  AND token = '5dHM4GAETLlJsKeQ2jZmL3Phs3PS2U9m8tu+M/+iJXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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