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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274290a88820a607742a8c2a39806d8b757d5451a18adaa50dcc1c93bc2f23ba' 
  AND token = 'pE1mQzMLXH5/PKMyuEF94gvJgrUjrdkNPuAMrMCjeSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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