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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05246379698cd14da4bc6ac2119366777c00b2c12d9d72f4b8069559545162a5' 
  AND token = '7cyUhXQE+lqM5x57659OB69TR3UfsNJB+zq/7OQR/rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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