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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d176a47c7c0d0d36e4b0388bc98c2b823d3c6309ee53ce2ea8d4a3083bb9ec' 
  AND token = 'XspNJ+nvo5Iv4tZqh/rFbG0YsneVexMhe8NEoBPuj10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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