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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea504d3e0e1fade56f18b583b56fccd276cc19dcba9630da32bd6c03355c2b0' 
  AND token = '31NBih0f+AEkVWHFt+vvO2P9REE5OSaZbidcqj68ylc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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