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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e618f4f0fe1e9891c13f488fbaf097d511c39afc411892ad12b167357316522f' 
  AND token = 'UEsKa/g2gFjE8tSekJ8lnDDn9NzssdCM7hZLGivXwM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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