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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3decbd12b08a952e589052bdc5f127dc2ea32448bc0d672db528a23f4ff578' 
  AND token = '1iVrt7N+ip0r4fMRl3DJP5tlZ+Uwdy9KeIlPptEO8mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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