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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62a8961608b50a4c364820b6f45aef9725f0dbcfd46f64527c2aea8089d0205' 
  AND token = 'tIxEJShnA2KHX1ZbsA1FKhE0Fg+2K+0K19xESJrnrWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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