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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcb06b1ad7956fd93937c1f1fbaf82f8ebe561dfe2c98444e9ff1a628e63adf' 
  AND token = '3altMn+Ae5GtVGVJoyI0dksUaILL/YaO3LmQFaLTt7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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