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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92844009f00c5f1a3b3ddc14bf9985e347942509cf967952f0ce32343c744bf3' 
  AND token = '9EWKoIgqjcU5kZtI0J+aTPuZ5Gj8L/v8Uy0pkxaXOko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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