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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de7f65d5db00e918db6f37d435bfcd6f100a49d233c7c823472e0da02f3d8be' 
  AND token = '9nEgi8dYcgOSYg2lt0AqojKMDRYUyNgPXt8V+BIgees=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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