Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7ea9a2179dc1af42472ffa0b958f8f5e87ea1c9d6e61f119e2378abb89ac3e' 
  AND token = 'nfMMn724h+El1Hw2VxydSY37D4gcaNiJVj0uUE8/rOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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