Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cb44ff1079940c8ebb9182514cee5cb85f5f524c3a36ddfd8a3a1d5e8a457e8' 
  AND token = 'i63y0SW0j3WmIOjhH+JQM2t2SaCtgKgGyUfPcSPYgvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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