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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0f275588a3d4db3dc4c8193d52d9d55b4e84aa0f15a51651ca7de0ad04d3960' 
  AND token = 'HyT0IFHEcKVmqSjWfTq+EKfdSO0GFausRgnJE5C47O4=' 
  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"
    }
  }
}