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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c375789a2c59a7b25db7d5cc4a952deefabb0d41a31f577cf413da1c4fa969' 
  AND token = 'OfZbRuxgXde2H73aO5r5PntfGXCOyth3HSn+RPNekeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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