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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c369a5646b692141de807e35f3981e686a806553ba98c5dd20d9b038123e44bc' 
  AND token = '9lGZx98hEqbCfNxSoxUnp0BNs5xNZc7MZQguI6qt4dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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