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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a10e29bd3eb6865af31210b6079e376809e4cf17d0b244a8830544d3b6d4730' 
  AND token = 'zUiiD7uYvLZsJ+HXeWaH9xWed0wnTT4NQyt9qx9kCR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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