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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a8048758a47f16478caaf0451ff7277ef1a4606233cb03fa0d78cbdec3f17f' 
  AND token = 'RRzU6EcjCDJEHUWp8F7lvnYqAMO8SDSOwhpheh2qMWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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