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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67891be490b627631f6c1acf78d1feefa1ca9f69b008cd57ce3385b0a8d9a4dd' 
  AND token = 'M71ZaUcB4R32w4+Tf8Y/2auflpLuMVfVSncBj5JkWEs=' 
  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"
    }
  }
}