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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b96be52f1795f69edc550ca02f758e0e75f1de1c55c10a5c48b2535609e811' 
  AND token = 'pJMrEGjKKS5JhEP7eSh7lIT53l5lzbyMBIanPgMTZwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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