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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6b77fede64d5a5ad1bafc642c605e298865f335d896dc0eb57a6ec1b0b041d' 
  AND token = '3UFBnNhCToHttpKzDO81Nnn9MfIK6Do9YHgKrRwcwbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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