Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8384a3eb899983e5e00e9af6ca53fa0975629640b366d7d2a9e5fe3a6bda275' 
  AND token = 'eu2DFIx6EfLOZmUOm4rexmIuFQE+WioQ0p8e+9MT0Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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