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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af651a85876216e8d604db0b13ba59b31e6014d9f19582202d0ed9a68febd5ad' 
  AND token = 'jxG8NiTbDQNjjnkdeDHqFr4a8nWWhGcwZhpOcR/Tw6o=' 
  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"
    }
  }
}