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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56c02db51edd1e116e0e403199f5a7ba5a25251968c949ab1cabc0af2f6700f' 
  AND token = '99P6rc7f67MQ6mUy2bNSWWapE+PDo8W8bfdPJryGhNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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