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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8a986ded8765a1ad429622869de0a14737048d0acaf9cffb059d7bbb085d5e' 
  AND token = 'dDnRqKRmrzsmletFtxHqPL5vuh/DApJ7OzRbfe7NKCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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