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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0a9508f3d947d49df9eadbf94125158b5f905dfa9856731c5395d0b0323395' 
  AND token = 'o2sn+A/5Wm30KzBoPu8Z1S0UTSruh2OCb61yHmDI3TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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