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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efce386f84d76d47ff5ebbc203e6c5ad1b8219765813a99eb16ff3e8a30066e5' 
  AND token = 'ix86W9DadE15hHsx2hP8Msg1CmOMApAkfNKqBnD3pz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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