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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28349a58e9779e55406fb0da388363007cfdcf9e2deaf254098b07c1a7ddfa9b' 
  AND token = 'z4HmIAPtaW+YT1omYmAqm4B6mu/gvs64+PNvi/uCBMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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