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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21e142dfd025c3d3f06c1d26db13534955c2b9e4881b4fa67bb52dcb9e1b84b5' 
  AND token = 'VfpT4ElrYVRT65TnVVY0MZUK0/Zq19l0Bx26Ojnhpgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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