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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040ff97649bfa7305defc853cbe31cd51b0f8f18df53057151e76eb0c90a7623' 
  AND token = '3wAnvbOgn2W2Laca+37jnUJtXFVhVT0c0k+ZF9OExpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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