SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b53d358c8f65de7c7a697f99e876418136d1cd2849fe49b12bb901342c101c' 
  AND token = 'EZUzPYv4xf0aeoIvXFpnWYOfmeVV+h3g0Z6yBSEwvRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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