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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49afae6616231073558ca6176dc267a1bd2d01ec2d28cac32c154e252f496f41' 
  AND token = 'rR5nY/rtmmMwu4t87sCeXH0DcTxxFnPfJsADb5a1UjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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