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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c57614b8779f75e52cf54411f0735abfadfd9d9891a4d9fb8ee8ceea767c0ca6' 
  AND token = 'uXOjTW+7tlD91Pkn5oUq2jrgk2Q5XlPcCPVvZuqGk0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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