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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd457877368bdfab7cefdbd7b1d56f5739eb6273c4e7b5f213dbc6b2d6ebb2248' 
  AND token = 'XdRtUperuPNg6Onu81AObw55vKMZFsyMKZTW+vUqkpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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