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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f53b9192aa7410f8d532d410d6bf698e0580e786cf41b608eda588e81412cc0' 
  AND token = 'MVaIuk5suqTSrCtxEVEOqgCbYWj8QVtXnFv6Sdaj3l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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