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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9165eac715f635ae4bc35792dd79196abffc14f124a7bbf6c62e46ad88635efe' 
  AND token = '0fYcOzEY8KkrgmIbV691nL9hO/ds9wblYcAl0xdeauI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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