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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68f791769808266998230089b81f807d4c356f357e0758c2d8f1e147c4d87f37' 
  AND token = 'B7S4Iocb9WIhWUyFlqFRyetmKOa1dDG4l94R6KpJhf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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