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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da5b280b368580d6da8b073af598d7718b8fd6aa2af396db78ff0e2ac7251f2' 
  AND token = 'AxCMfhNFAqd7iMRUsgIroX7gKddGMdz+v79SbiJ7D4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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