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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aea0db9cb836f9f5ae35ec406c759696c1b680b99f92368c7b0ba562d4148df' 
  AND token = '2ou6BxtG7uo4e097SbnhQeWYtVO0BUGvRtvdP7/Dya0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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