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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8460ec3b8319d1b5e63dfd6183d697d590d9157fe32fb4f2297ee7f7b5b9fab9' 
  AND token = '8f6ijGHWi4vJ+4MIHnIkr3f2VKO+W4RQdXlkQvuCHOQ=' 
  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"
    }
  }
}