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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cff2adc30028922b9a5dd788928369ca47fa19ce9efd4e1cf7807303d0a3d3' 
  AND token = 'EiqsfvkKIJQkCG2LlppuY8KKyMmHc3fShpR8F1NUIJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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