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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d63d3e8be7b01361131d0f855e04d178f451714f0efa01cb01689a88b747d12' 
  AND token = 'ZHz2A8KZdf8h5PEjs40A+gPTlUvx9KQK5mq244XBq+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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