SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9bd79da64fb663c3b812089f7bd3c56828c87ef2992d8f2bc474161f35c9d9' 
  AND token = 'kKaGuZ0iH+qsfeOJr/dHqZ3/utv52U7qn2vjupXgXxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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