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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608f19cf964dcaa0c924c38e22c7d06d7194e8621e8710768f8d8734d805ae01' 
  AND token = 'NDfqTscOovr0R+5pgMr1R+gmfnHzgDh2gyI+EfZLxnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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