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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7333c72129b9e3d7b7630ea3a55d9d6769c80fb55fc84570f859f14ccf819361' 
  AND token = 'gZ3x8WfIw1KZCyfB918W7tnvIWak/icbvYRR0QsJfUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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