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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9590a8f22ee0d4a7fe83555547657c4367764c5f25a008579efefd22d614a222' 
  AND token = 'fK4GIe2Oifw8m2o50LhMkIUMnyKZ2Dm2rvTVW2NLr4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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