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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f7c584fe64ca53fc997f5689fefbc7e611d7b7b6097331a21005e83a98f587' 
  AND token = 'M8GtI8XTE+fDgp4IoWaxcXzyDzy27sOI3uC8oQtzGVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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