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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0fe77decb8fb3ae1cd1bf5488b1838ec6f97d0071acb32d6a1815b74435c13' 
  AND token = 'uF7QFeYCLxh71aq9KEdO6pJS/5U8t5r5aQaCd3GpRmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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