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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd1519339059802d3bfca5bafb82a37809a12f466f154c10189f7c5c34eb20a' 
  AND token = 'I/xMuRwpjafcUuv1Jh3eRpTSk2Pn8WaGX8RuJlX2JXE=' 
  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"
    }
  }
}