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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d054d82ae3526728450457bc3a27830ffa01e9857c55f6433fc0da9687719e' 
  AND token = '69Kpy19wfrUiHdmL1QGrgIjl2XPRoa/My4XJ4zfxTuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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