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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26384bf8e1c014be3d076810e4d673bfab76f55a57378300510383d0c2b7567e' 
  AND token = 'SxeuDYP0lzLjvIlfxtHunw30GGdxhkSKoxHHQAKrTnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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