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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6519800a06610b18c033808658ae69c28fd1dd41dbe5564cff825328323c0749' 
  AND token = 'dpajQXiVTRn0uQ+oGjJ/dmRf4f8ffgq6tI6SmScMG7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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