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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e40b774cdd98a365685688220ee3a71c496c76a6a6fe0d64216b0c52f9136fb' 
  AND token = 'ZiIUbA3+eM0/5RisNzXHJ/hArDfC95xMb9FFAq5nmQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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