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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c638c1e5b6fea02cbe18046c796b41aa0e77e5669df1f4be44e5ab6cef676392' 
  AND token = 'HoZWJKzRd74jCyiGyw6c3Hf7kZnz/fFQsGfa214hqtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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