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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33b1e040ecbab6d959e8378c9e95802ea3e544aed85c347deffb923a82f747c' 
  AND token = 'cMYxgsvK3KzrOVTDWRK1J9x5F1C0PJQZ8+OAbrzuDcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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